$users_id = 1;
$url = 'http://mydd.0317cn.net/index.php/Home/Logo/res/users_id/'.$users_id; //二维码内容
$errorCorrectionLevel = 'L';//容错级别
$matrixPointSize = 9;//生成图片大小
//生成二维码图片
Vendor('phpqrcode.phpqrcode');
$object = new QRcode();
$ad = 'erweima/'.$users_id.'.jpg';
$object->png($url, $ad, $errorCorrectionLevel, $matrixPointSize, 2);
$logo = 'erweima/2.jpg';//准备好的logo图片
$QR = 'erweima/'.$users_id.'.jpg';//已经生成的原始二维码图

if ($logo !== FALSE) {
$QR = imagecreatefromstring(file_get_contents($QR));
$logo = imagecreatefromstring(file_get_contents($logo));
$QR_width = imagesx($QR);//二维码图片宽度
$QR_height = imagesy($QR);//二维码图片高度
$logo_width = imagesx($logo);//logo图片宽度
$logo_height = imagesy($logo);//logo图片高度
$logo_qr_width = $QR_width / 5;
$scale = $logo_width/$logo_qr_width;
$logo_qr_height = $logo_height/$scale;
$from_width = ($QR_width - $logo_qr_width) / 2;
//重新组合图片并调整大小
imagecopyresampled($QR, $logo, $from_width, $from_width, 0, 0, $logo_qr_width,
$logo_qr_height, $logo_width, $logo_height);
}
//        输出图片  带logo图片
imagepng($QR, 'erweima/'.$users_id.'.png');